Substantial corrosion of Babbit turbine and reduction gearbox bearings has been found over recent years in ships. The nature of this corrosion appears identical with that previously called tin oxide corrosion in that it takes the form of a hard black surface layer. A simple test method has been developed which can produce the corrosion under laboratory conditions and is sensitive to the lubricating oil used. Eleven turbine oils of various properties have been compared and their corrosive properties found to differ greatly. Chlorinated wax EP additives have been shown to cause Babbit corrosion under certain conditions. A more elaborate experimental method has demonstrated that concentrations of water as low as 500 ppm can render an oil corrosive. The corrosive mechanism has been considered, and a reaction scheme involving three steps proposed. Possible remedies are discussed in the light of the evidence given.

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  • Corporate Authors:

    Institute of Marine Engineers

    Memorial Building, 76 Mark Lane
    London EC3R 7JN,   England 
  • Authors:
    • Hiley, R W
  • Publication Date: 1979

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00311620
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: Part 2
  • Files: TRIS
  • Created Date: Jun 9 1980 12:00AM